水热法合成条件对氧化锆晶相影响的光谱研究

以硝酸锆为前驱物,用水热法分别合成了纯单斜相、四方相以及四方和单斜混合相的氧化锆纳米粒子.应用XRD、拉曼光谱和TEM探讨了水热过程中前驱体浓度、晶化温度和晶化时间对ZrO2晶粒尺寸和相变的影响.结果表明,水热制备过程中上述合成条件均影响ZrO2晶粒尺寸,其中晶化温度对其影响最大,但是晶化温度对ZrO2的形貌影响不大.延长晶化时间有利于单斜晶相的形成,而且随着晶化时间延长,ZrO2的晶化程度增加.在水热合成过程中采用较低的前驱体浓度、较高晶化温度及延长晶化时间有利于控制合成单斜相ZrO2.     

大浞河铁矿地下开采应对炮孔破坏的实践

山东盛大矿业股份有限公司大浞河铁矿矿体破碎、中深孔破坏严重。通过采取光爆、完善支护方式、补孔、孔底逐孔起爆、缩短炮孔存在时间等措施,经过三年多的生产实践,摸索总结出大浞河铁矿地下开采炮孔破坏的影响因素,解决了生产中出现的炮孔破坏问题。保证矿山生产持续稳步发展,为同行业类似矿山提供了借鉴。     

Ni修饰氧化钛相变的紫外拉曼光谱研究

The Ni-modified TiO2 was synthesized using two methods including co-precipitation(Ni doped TiO2, Ni-TiO2) and wet impregnation(Ni loaded TiO2, Ni/TiO2). The surface and bulk crystalline phases of Ni-modified TiO2 were investigated by using X-ray diffractometry(XRD), UV Raman spectroscopy, TEM, and SEM. It is observed that Ni doping can promote the phase transition and grain size growth of TiO2. Moreover, the propagation of the rutile phase from the bulk into the surface region of TiO2 is increased when the Ni doping amount reaches up to 3%. However, in Ni/TiO2, it is found out that the surface and bulk phase transformation of TiO2 can be inhibited after impregnation of 1% of Ni on the TiO2. Compared with the co-precipitation method, Ni species may be more enriched in the surface of the Ni/TiO2 sample upon adoption of the impregnation method, and the direct contact of anatase particles of TiO2 is avoided. As a consequence, the phase transition in the surface and bulk region of TiO2 can be effectively inhibited by Ni loading. Additionally, the activity of the photocatalytic degradation of RhB on the 3Ni-TiO2-600 ℃ sample is higher than that on the 3 Ni/TiO2-600 ℃ sample. The phase junction formed between anatase and rutile in the surface region of 3Ni-TiO2-600 ℃ may the main reason for its high photocatalytic activity.     

Studies on the Hydrogenation of Acetonitrile over Fresh Mo_2C/γ-Al_2O_3 Catalyst by In-situ IR Spectroscopy

The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibited strong interaction with the fresh Mo2C/γ-Al2O3 catalyst and was adsorbed mainly on Moδ+ sites of fresh Mo2C/γ-Al2O3 catalyst. Moreover, CH3CN could affect the shifting of IR spectra for CO adsorption towards a lower wave number. The IR spectroscopic study on acetonitrile hydrogenation showed that CH3CN could be easily hydrogenated in the presence of H2 on the Mo2C/γ-Al2O3 catalyst. Furthermore, it was observed that CH3 CN could be selectively hydrogenated to imines on fresh Mo2C/γ-Al2O3 catalyst. Additionally, the active sites of fresh Mo2C/γ-Al2O3 catalyst might be covered with coke during the hydrogenation reaction of acetonitrile. The treatment of catalyst with hydrogen at 673 K could not completely remove coke deposits on the surface of the Mo2C/γ-Al2O3 catalyst.     

钼镍磷催化剂丙烯加氢中试评价的研究

以三氧化钼、碱式碳酸镍、磷酸为原料制备钼镍磷(Mo-Ni-P)浸渍溶液,以三叶草型γ-Al2O3为载体,采用喷淋饱和浸渍法制备了Mo-Ni-P/γ-Al2O3催化剂。考察了不同胶溶剂、焙烧温度、浸渍方法等条件对Al2O3载体物化性质的影响。实验表明,胶溶剂种类影响Al2O3载体的比表面积,对比孔容影响较小,柠檬酸或硝酸作为胶溶剂,Al2O3比表面积增大,而醋酸或磷酸作为胶溶剂时,Al2O3比表面积减小。在100mL反应装置上,以含体积分数11%丙烯的丙烷为原料,对Mo-Ni-P催化剂的丙烯加氢性能进行了评价实验。实验表明,预硫化能改善钼镍磷催化剂的丙烯加氢反应性能,在1 100h的评价实验中,钼镍磷催化剂的催化活性一直没有明显的变化,说明钼镍磷催化剂具有良好的稳定性。     

中深孔排炮拉槽在缓倾斜破碎矿体中的应用

山东盛大矿业股份有限公司大浞河铁矿设计使用无底柱分段崩落法采矿,工程揭露发现矿岩稳固性与地质资料差异大,原设计支护方式无法保证中深孔回采,矿山的生产能力及采矿安全受到影响。完善支护方式后在-240 m水平0～3线之间的123进路进行中深孔排炮切割拉槽试验。同时采用微差爆破技术降低爆破地震破坏效应。通过实践摸索出适合大浞河铁矿的切割拉槽方法,保证了矿山生产的持续稳定发展。     

使用黏结剂和造孔剂对粒状干法脱硫剂调控的研究进展

随着“碳达峰”“碳中和”目标的提出,促使企业更加关注SO₂的脱除问题。由于干法粒状脱硫剂材料廉价易得、制备方法简单、脱硫性能高、制备过程易于操作等特点,干法粒状脱硫工艺将成为未来烟气脱硫的发展趋势。介绍了干法粒状脱硫剂中需要使用的黏结剂和造孔剂,在脱硫剂中添加黏结剂可以增加脱硫剂的机械强度和脱硫效率,使脱硫剂不易粉化;在脱硫剂中添加造孔剂可以提高其比表面积和孔隙率,从而增加脱硫剂与SO₂的接触机会,进而提高脱硫效率。在干法粒状脱硫剂中添加廉价易得的黏结剂和造孔剂,提高脱硫剂的脱硫效率、降低成本是今后的发展方向。     

[采矿工艺优化研究(实践)阿尔哈达膨缩矿体空场法采矿工艺设计优化研究

阿尔哈达矿区矿体形态复杂,厚度发生较大变化时空场法采矿往往存在许多问题。通过优化采矿设计研究,降低了采切比,既节资降耗又安全高效,促进三级矿量平衡,解决了膨胀夹缩矿体空场法采矿成本高的难题,为本矿山开采复杂矿体提供了技术支持,也为同行业类似矿山提供技术借鉴。     

阿尔哈达矿区残矿回采技术实践

阿尔哈达矿区民采期间开采顺序不合理,大量存窿矿及矿柱处在高应力集中区,回收存在安全隐患,资源浪费严重。选取892m水平1#采场存窿矿及848m水平7#采场顶柱进行试验,通过使用地质钻机探查采空区,选用中深孔分段崩落法回采工艺,采用分段毫秒延期起爆技术,降低爆破振动效应,保护爆区周围主要巷道,解决高应力集中区存窿矿及矿柱回收难题,实现安全高效生产。     

阿尔哈达膨缩矿体空场法采矿工艺设计优化研究

阿尔哈达矿区矿体形态复杂,厚度发生较大变化时空场法采矿往往存在许多问题。通过优化采矿设计研究,降低了采切比,既节资降耗又安全高效,促进三级矿量平衡,解决了膨胀夹缩矿体空场法采矿成本高的难题,为本矿山开采复杂矿体提供了技术支持,也为同行业类似矿山提供技术借鉴。